Communications: radio wave antennas – Antennas – Body-attached or connected
Patent
1993-04-02
1995-09-12
Hajec, Donald
Communications: radio wave antennas
Antennas
Body-attached or connected
343741, 343767, H01Q 127, H01Q 144, H01Q 700
Patent
active
054500915
ABSTRACT:
An arm-attached band type radio apparatus capable of providing a stable antenna gain without being affected by the band size has an arm attaching band that is formed into a loop by way of a buckle 31 having an metallic electrode plate 32, first and second conductor plates 5L, 5R, shaped so as to form a slot antenna, to form a loop-like slot antenna. The distal end side of conductor plate 5L has an overlap capacitance changing portion 15 so that, when the connecting position of the band changes according to the thickness of the wearer's arm, the overlap capacitance between first conductor plate 5L and metallic electrode 32, is changed. The magnitude of the capacitance change corresponds to a change in the inductance of the antenna to compensate for a shift in the resonance frequency. The overlap capacitance can be changed by controlling the overlap area or the effective dielectric constant of the material separating conductor plate 5L from metallic electrode 32.
REFERENCES:
patent: 4922260 (1990-05-01), Gaskiu et al.
patent: 4973944 (1990-11-01), Maletta
patent: 5134724 (1992-07-01), Gehring et al.
patent: 5243356 (1993-09-01), Hama
Carothers, Jr. W. Douglas
Hajec Donald
Le Hoang-anh
Seiko Epson Corporation
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